linux-kernel - Re: Implementation of POSIX mqueues in Linux 2.6

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Message-ID: <20070803102325.GY2063@devserv.devel.redhat.com>
Date:	Fri, 3 Aug 2007 06:23:25 -0400
From:	Jakub Jelinek <jakub@...hat.com>
To:	gregfe <gregfe2002@...oo.fr>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Implementation of POSIX mqueues in Linux 2.6

On Fri, Aug 03, 2007 at 09:59:32AM +0000, gregfe wrote:
> I find little documentation on the actual implementation of POSIX message
> queues in Linux, and need some advise. In particular, I am wondering
> whether it supports inter-process *and* inter-thread communication, and if

Not sure what exactly you mean by inter-thread communication, whether
communication between threads within one process or between threads from
different processes.  You can use mq_* for either, except that mq_notify
registered signal notification is sent to the process that called mq_notify,
not thread (and for SIGEV_THREAD a new thread is created).

Though of course for communication between threads within one process
mq_* is a huge overkill.

> On more thing: kernel's "make menuconfig" of
> version 2.6.11 says :
> 
> >> To use this feature you will also need mqueue library, available
> 
> >> from <... a URL ... to M. Wronski's and K. Benedyczak's home page>"
> 
> Is it still up to date ?

No, glibc supports mq_* APIs for more than 3 years now.

	Jakub
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